Differences in the Composition of Various Brands of Automotive Brake Fluid Analyzed by Raman Spectroscopy João Vitor Santa Rosa Gino, João Batista Cyrino Florence, Landulfo Silveira Jr.

Abstract

Brake fluids contain additives such as ethylene glycol and propylene glycol, which possess characteristics to meet brake system specifications. Characterization and identification via Raman spectroscopy are crucial for analyzing the properties and qualities of various substances. In this study, four different brands of brake fluids classified as DOT3 and DOT4 were analyzed using Raman spectroscopy to compare them and identify potential similarities or distinctions. It was found that in two brands, there is a similarity between the DOT3 and DOT4 spectra, suggesting a similar composition, while the other two brands differ both from each other and compared to the former ones.